Atmospheric Change and the North American Transportation Sector Summary of a Trilateral Workshop (1998) / Chapter Skim
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Atmospheric Changes Resulting from Transportation Activities
Atmospheric Changes Resulting from Transportation Activities
Pages 6-9
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Because of this multitude of sources and emission mechanisms, MSE estimates are highly uncertain; emission inventories for some gases are thought to be incorrect by as much as a factor of two. Predicting future emission levels is even more challenging, as one must try to estimate fleet turnover rates, future travel demand, the market penetration of alternative fuel vehicles, and several other factors.
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From page 7... ...
33 E9gum3. Average measured concentrations of the air pollutants O3, NO2, and PMIo in selected cities during the years 1988 1993.
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G/oba/sca/e atmospheric changes Mary Anne Carroll, a professor from the University of Michigan, explained that the transportation sector also contributes to global scale atmospheric changes including perturbations in tropospheric oxidant levels, increased concentrations of greenhouse gases and aerosols, and stratospheric ozone depletion. Compared to the issues discussed in the previous section, these global scale problems can be much more difficult to address, because the ultimate impacts are usually indirect and difficult to quantify.
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From page 9... ...
Surface transportation is not the only contributor to atmospheric change aviation constitutes the fastest growing component of the transportation sector, and it may contribute to the global scale atmospheric changes described above. Howard Wesoky, from the National Aeronautics and Space Administration, talked about the major research and assessment programs (both in the U.S.
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